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Sighting in a Mil/Mil Scope |
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Old Soldier
Optics GrassHopper Joined: June/01/2012 Location: Out West Status: Offline Points: 22 |
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Since most guys start with a 100yd zero, measuring the adjustment makes sense if they have a scope with MOA adjustments vs MIL. Of course they could also convert the mil error to MOA and then make the adjustment but that gets tricky with something like 3.375 X 1.5 mils = 5.062 MOA. Easier to measure the target.
OS
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Sparky
Optics Master Extraordinaire Joined: July/15/2007 Location: SD Status: Offline Points: 4569 |
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This worked? I thought that if you had 1/2MOA adjustments that is what it is a 100yds. And at 50yds each click would be 1/4 and not 1/2. |
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koshkin
MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 13181 |
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MOA stands for minute of angle. It is independent of distance. 1/2 MOA at 100 yards is ~0.5 inch 1/2 MOA at 50 yards is ~ 0.25 inch.
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Sparky
Optics Master Extraordinaire Joined: July/15/2007 Location: SD Status: Offline Points: 4569 |
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My bad, I was thinking 15 inches and not 15 MOA.
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Marine24
Optics Journeyman Joined: June/07/2010 Location: Monument, CO Status: Offline Points: 687 |
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So using this method, you can develop your own dope for known ranges. At a known distance, use the method described above to establish your zero for the range desired (i.e. 200 meters). Move to the next known distance (say 300 meters), fire your group, make the necessary adjustments and you have the number of clicks you need to come up for that particular distance. Continue the process until you've filled out your data book for the ranges you are interested in. In the end, you'll have the clicks necessary for the known ranges and the holdover for that particular load/ammo lot.
Is my understanding/conclusions correct?
I'm coming from a hunting background where maximum point blank range is more of a factor or shooting with iron sights. Conceptually, the practice adjusting your POA based on the spot of a well fired round with iron sights helps me understand this concept.
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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That is correct. That is really the only way you can do it. You can use ballistic calcs to get close, but shooting is the only way to get real dope.
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
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Marine24
Optics Journeyman Joined: June/07/2010 Location: Monument, CO Status: Offline Points: 687 |
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Lot more efficient method than checking a drop chart from a manufacturer, which is typically listed in inches, doing the math to convert to mil or moa clicks, making the adjustments to the scope, firing a group and then making adjustments again.
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tpcollins
Optics Journeyman Joined: January/12/2009 Status: Offline Points: 428 |
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I do something similar but in reverse when mounting a regular scope after getting it close with my Zero Point. I aim at the bull and shoot. Re-aim at the bull, hold the rifle steady, turn each turret until the crosshair aligns on the POI.
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TBonez
Optics GrassHopper Joined: June/06/2013 Status: Offline Points: 10 |
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Rancid, If I was using a laser boresight and forgive my newbness but I could just then turn my turrets to match where the laser is pointing right? no need to take shots correct?
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TBonez
Optics GrassHopper Joined: June/06/2013 Status: Offline Points: 10 |
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Sorry for the other post lol... So if I was using a laser boresight - and forgive me for my newbness - but couldnt I just turn my scope to match the laser and not fire any shots at all? Might be an obvious yes answer but I just want to be sure I'm sighting correctly in that process...
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Sparky
Optics Master Extraordinaire Joined: July/15/2007 Location: SD Status: Offline Points: 4569 |
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You will still need to shoot a group to verify. For me I have never had a laser bore sighted rifle match the actual bullet impact. I have how ever heard of it working for some people. Just not me. And you will not know unless you fire a few rounds.
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Cold Trigger Finger
Optics Apprentice Joined: December/20/2013 Location: Int.Alaska Status: Offline Points: 209 |
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This was my understanding of the usefulness of a mil/ mil quad reticle. To use it as a measuring device. . Save a lot of walking and math. For those who are math challenged like me.
I've used the 2 shot method. And has been mentioned I found shooting a group to be more reliable for a general hunting rifle. |
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Theo
Optics GrassHopper Joined: June/20/2013 Location: La, USA Status: Offline Points: 23 |
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In my experience, I always remember " BS "... B=Bullet POI TO S=Scope
POI. I use this consistent scope turret movements for both Bore
Sighting(BPOI=Bulls Eye) and Zeroing(BPOI=Actual Impact) adjustments!
Simply, if the Bullet POI is at the 10o'clock position from the Bulls Eye (say 1 moa to the left & 1 moa up), I dial 1 moa elevation to the right, and 1 moa windage down, adjusting turrets as a measurement (use mil specs if appropriate). I don't hold the rifle perfectly still to visualize the change while looking through the scope. I find the measurement method easier, following the logic of turret direction, but either will get you on ZERO! Works for me, but can verify here Scope Zeroing and of course, page one Here of the OP...Christopher! |
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stifun
Optics GrassHopper Joined: January/04/2014 Status: Offline Points: 5 |
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that's ok when zeroing in but when you've zeroed in and looking at targets varying in distance you need to know that 2 mil dots down =10 or 12 or how many yds it is at that distance so 30yds zero, target 47 yds what dots do you look at
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Cold Trigger Finger
Optics Apprentice Joined: December/20/2013 Location: Int.Alaska Status: Offline Points: 209 |
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Good question.
One I don't know the answer to. |
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If it can't be grown, It's gotta be mined |
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stifun
Optics GrassHopper Joined: January/04/2014 Status: Offline Points: 5 |
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I hope some one does http://www.opticstalk.com/smileys/Whacko.gif
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Mike220
Optics GrassHopper Joined: January/08/2014 Location: Tx Status: Offline Points: 9 |
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Good write up! This Is why I always reccomend folks to get the 1/10 mil turrets to match there milliradian based reticle. The adjustments match the grid. Its also helpful to know what the value mil holds In relation to yardage. 1 mil at 100 yards = 3.6" with your 1/10 turret one click eguals. 36" 1 mil at 200 yards has a value of 7.2" with a 1/10 click value of. 72" so on and so forth. Once you get the basics you can also range targets with your reticle. The only inch value I use Is for my target heights. If you know the height of your target that can be used along with your reticle. Target height In inches divided by # of mils read x 27.78 eguals distance to target.
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jonoMT
Optics Master Extraordinaire Joined: November/13/2008 Location: Montana Status: Offline Points: 4853 |
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I prefer to convert the target width or height (whatever's being measured) to distance units first (yards or meters), e.g. 18" = .5 yards. Multiply that times 1000 and you have the distance at 1 mil, e.g. 500 yards. Then divide by mils read, 500 / .8 mils = 625. Metric users have it a bit easier, since all units are decimal, e.g. 54 cm = .54 meters. With yards and inches, I found it helped to remember that every 4 inches is ~.11 yards: 4 0.11 8 0.22 12 0.33 16 0.44 20 0.56 24 0.67 28 0.78 32 0.89 36 1.00 Got a target size like 19"? Just go with 20, especially if the mils read is greater than 1. Frankly, if you're dealing with a target less than 18" and are reading less than .75 mils, you'd better be really good. The farther out you shoot, the harder it is to range and ballistics are increasingly not in your favor. If you're off by 25 yards at 750 yards that's probably a miss. |
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Reaction time is a factor...
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Mike220
Optics GrassHopper Joined: January/08/2014 Location: Tx Status: Offline Points: 9 |
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To much there for me to keep up with lol. Ill stick to what's easy for me. Can have alot of fun with It. Chrony your loads. Run through a ballistics trajectory program. Gets you close. Nothing beats actual range time though. Always good to keep data wrote down for various shooting conditions. Do the same thing with my hand loads.
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stifun
Optics GrassHopper Joined: January/04/2014 Status: Offline Points: 5 |
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thanks for that mate ,its been interesting I think I need a lot of range time to get to know my scope ,I have a competition in Feb so fingers crossed I will have it sorted ,off to the range now see you in 3 weeks
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